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    我是iframe！ 里面有一个a标签
    <a href="//baidu.com" target="_top">top</a>
    <a href="//baidu.com" target="_self">self</a>
    <br /><br />
    <iframe
      src="a-target-iframe2.html"
      frameborder="0"
      style="width: 500px"
    ></iframe>
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